Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures
Abstract
Despite having otherwise outstanding mechanical properties, many single-phase medium and high entropy alloys are limited by modest yield strengths. Although grain refinement offers one opportunity for additional strengthening, it requires significant and undesirable compromises to ductility. This work therefore explores an alternative, simple processing route to achieve strength by cold-rolling and annealing an equiatomic CrCoNi alloy to produce heterogeneous, partially recrystallized microstructures. Tensile tests reveal that our approach dramatically increases the yield strength (to ~1100 MPa) while retaining good ductility (total elongation ~23%) in the single-phase CrCoNi alloy. Scanning and transmission electron microscopy indicate that the strengthening is due to the non-recrystallized grains retaining their deformation-induced twins and very high dislocation densities. Furthermore, load-unload-reload tests and grain-scale digital image correlation are also used to study the accumulation of plastic deformation in our highly heterogeneous microstructures.
- Authors:
-
[2];
- The Ohio State Univ., Columbus, OH (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1493134
- Alternate Identifier(s):
- OSTI ID: 1637001
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 165; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; High and medium entropy alloys; Ultra-high strength; Twinning; High ductility; Heterogeneous microstructure
Citation Formats
Slone, C. E., Miao, Jiashi, George, Easo P., and Mills, Michael J. Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures. United States: N. p., 2018.
Web. doi:10.1016/j.actamat.2018.12.015.
Slone, C. E., Miao, Jiashi, George, Easo P., & Mills, Michael J. Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures. United States. https://doi.org/10.1016/j.actamat.2018.12.015
Slone, C. E., Miao, Jiashi, George, Easo P., and Mills, Michael J. Tue .
"Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures". United States. https://doi.org/10.1016/j.actamat.2018.12.015. https://www.osti.gov/servlets/purl/1493134.
@article{osti_1493134,
title = {Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures},
author = {Slone, C. E. and Miao, Jiashi and George, Easo P. and Mills, Michael J.},
abstractNote = {Despite having otherwise outstanding mechanical properties, many single-phase medium and high entropy alloys are limited by modest yield strengths. Although grain refinement offers one opportunity for additional strengthening, it requires significant and undesirable compromises to ductility. This work therefore explores an alternative, simple processing route to achieve strength by cold-rolling and annealing an equiatomic CrCoNi alloy to produce heterogeneous, partially recrystallized microstructures. Tensile tests reveal that our approach dramatically increases the yield strength (to ~1100 MPa) while retaining good ductility (total elongation ~23%) in the single-phase CrCoNi alloy. Scanning and transmission electron microscopy indicate that the strengthening is due to the non-recrystallized grains retaining their deformation-induced twins and very high dislocation densities. Furthermore, load-unload-reload tests and grain-scale digital image correlation are also used to study the accumulation of plastic deformation in our highly heterogeneous microstructures.},
doi = {10.1016/j.actamat.2018.12.015},
journal = {Acta Materialia},
number = C,
volume = 165,
place = {United States},
year = {Tue Dec 11 00:00:00 EST 2018},
month = {Tue Dec 11 00:00:00 EST 2018}
}
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